body {
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  display:flex;
  flex-direction:column;
  align-items:center;
  margin:0;
  padding:16px;
  background:#0b1220;
  color:#eee;
}
h1 { margin: 8px 0; font-size:18px; }
#hud { margin: 6px 0 12px; }
canvas { background: #071028; border: 2px solid #1e2a44; display:block; max-width:100%; height:auto; }